Nonperturbative gauge fixing and perturbation theory - art. no. 034504

We compare the gauge-fixing approach proposed by Jona-Lasinio and Parrinell o and by Zwanziger (JLPZ) with the standard Faddeev-Popov (FP) procedure, a nd demonstrate perturbative equality of gauge-invariant quantities, up to i rrelevant terms induced by the cutoff. We also show how a set of local, ren ormalizable Feynman rules can be constructed for the JLPZ procedure. Theref ore the physical observables of the JLPZ and FP versions are equal to all o rders up to a finite renormalization of the coupling constant.